Endless mandrel



9, 9 H. T. BATTIN 1,871,296

ENDLESS MANDREL Filed Nov. 22. 1929 l 32 .53 INVENTOR Patented Aug. 9, 1932 ,HARoLn '1. BATTIN, or nrnenwoon, NEW JERSEY, Assreuor romoneana WRIGHT,

OF DETROIT, -MICHIGAN, A CORPORATION MICHIGAN ENDLESS Manhunt. e

i nca me'd November 22,-1e29. Seria1"No.408,945

This invention relates to a device useful in the manufacture of rubber tubes such as inner tubes from rubber dispersions such as latex; More particularly this invention 'rei 5 lates to a-mandrel upon "which a rubber tube :can be formed by the deposition of the solid constituents of the rubber dispersion there- 'over, which mandrel is continuous and so constructed as to permit removal thereof from the interior of the tube after it has been formed. l

V In the manufacture of'rubbe'rinner tubes, itisusualto-construct the tube with two free ends and tosubsequently unite the ends of the rubber tubeto formv a continuous tube. The joint in such a tube is not desirable and the operation incident to making such a' joint is costly.

It is an object of this invention to provide a mandrel upon'which rubber may be deposited from a dispersion thereof in the form of a continuous tube." It is also an object of this invention to provide a mandrel for making such a tube which mandrelmay be removed from the interior of the tube through a small aperture in the tube. 7 Another object of this invention is to provide a mandrel composed of sections which may be released while the mandrel is covered by a rubber tube. A further object of this invention is to provide a mandrel upon which a continuous rubber tubemay'be formed'by deposition from a dispersion thereof, which mandrel is adapted to form an aperture in thetube durthe mandrel may be withdrawn.

view showing a modified ing itslformationthrough Which aperture Other objects and advantages of the pres- The mandrel of this invention is to be used formaking rubber tubes by the deposition of.

the solid constituents "of a rubber dispersion on the eiterlor surface ofthe mandrel. In

order to effect such a deposition ofrubber upon the surface ofthe mandrel, the mandrel is constructed so as to extract the serum from acteristics by making the mandrel hollow as indicated at 1 in Fig. l-providing apertures;

through the walls of the mandrel as shown at 2 providing the exterior surface of the mandrel with a knurled surface which facilitates the flow of the serum to the apertures and finally providing a smooth layer of material over the mandrel s'uchas a spiralwrap- V 'of fabric 4 which maybe coated with a clay slip. 'Other types of mandrel construction may be employed, however, fo-rinstance, a mandrel may be made of absorbent material 'in which case the serum will'be' extracted from thesurrounding dispersion by an absorbing'action ofthe material itself. Inlieu of'a serum extractingmandrel construction there may be employed a solid mandrel coated with material to effect thecoagulation of the rubber dispersion on the surface thereof. The described mandrel construction or any other type of mandrel construction which will enable rubber to be deposited on the surface'thereof maybe employed "for the purposes of .this invention' In order to 7 remove the mandrel from th rubber tubeafter the rubbedri'tube has been- -formed onfthe exterior surface of'the mandrel, it'is necessary to construct the mandrel in at least two sections. 'A joint must be provided between such sections which is operable whilethe rubber tube overlies the exterior surfaceof the mandrel so as to; separatetheends of the sections, and permit the with drawal of the sections through an aperture in the tube. In the form of inventionshown in Fig. 1, two semi circular sections 5and6 are provided. A greater number of sections may be provided if desired. The'sectionso and 6 havemembers carried in the" extremities tl'iereof WlllCllfllG constructed to interfitand to maintain the sections in alignment. One

7 air of such interfittin members is shown at from the members 7 and 8 are .providedaddi tional interfitting members 10 and 11 in sections '5 and 6 respectively, which have "the male a'nd female joint 12iaclapted to align'tlie 7 ting relation.

7 and 8 respectively in sections and 6 of the mandrel. The members 7 and 8 are fitted into the ends of the hollow mandrel 1 either bya drive fit or by screwing the members 7 and 8 into the mandrel or in any other suitable manner. I p v H provided a inaleand feinale 011159 for-align- In the members 7 and 8 are ing the ends ofthesections-When in int'erfit- At the ends of the sections 5 and tioppo'site endsxof the-.se'ctions5' and Sin inter-fitting relation; The members 10 and 11 may be united to the sections 5 and 6 many suitable manner as bya drive lit- Wherea i'vfrap of i fabric 4 is applied over the exterior surface attached to thelpin 18 formed posed extensions 'and 16.

'ofthe' mandrel the fabricis turned'over the ends of the sections?) andf6-as shoivn at 13 in Fig. 2 and, clamped between the members 10 and ll and, the sections 5 and 6"as' shoivn at 14 5111- Fig 2. A similar arrangement for clamping the fabriemay be providedbetrv'een .themerhbers"? and-8 andthe sections 5'and 6.

- In orderto maintainthesections'5 and 6 1n assembled relat on suitable clamping means-isprovlded 'Wl'llCh conveniently'is associated with one of, the pairs of interfitting' the interfitting members -10 and-11, and therefore the sections 5-and 6, together.

Where the mandrel is of the hollow serum removing type as shown in Fig. 1, tubes and 21.n1ay be provided-for vWithdrawing the serum from the interior of the mandrel'and are conveniently-arranged to extend through the extensions 15 and :16- of the interfitt-ing 1nembers-10-and'11'. Where-such tubesQO and Qlare provided a :pipe connection 22 be by the juxta- In. the .use of the, device shown in F-ig. 1 :the mandrel is immersed in a dispersion of rubber, the interior of the mandrel is'evacu-' ated and the serum ithdrawn therefrom through the tubes QO, 21 and 22. The rubber constituents of the dispersion deposit upon the exterior surface of the mandrel to form a'continuous rubber tube having an aperture surrounding the pin 18. .Aftera sufficiently thick deposit of rubber is formed the coated mandrel is removedfrom the dispersion, the

rubber is dried andvulcanized. The vulcanizing ingredients conveniently are incorporated in the dispersion. When the tube has been vulcanized the mandrel may be with drawn therefrom by firstremoving the col- 'lar19 so as to free the sections'5 andG, then separating the sections 5and 6, and with drawing the sections end first through the aperture formed in thefrubber tube surrounding the ,pin 18. The extensions 15 and 16 extending'throughthe aperture formed in the rubber tube are convenient in withdrawing the mandrel from the tube. If desired, after vulcanization of the "tube and before 'extractin'g themandr'el therefrom, air under :pressure'may be introduced into the-mandrel so as to inflate the rubbertube-aI-fd'thereby separate it from the surface-of :the 'mandreh The characteristics ofrubber laiddovvn from latex or like dispersions are such as to :permit the rubber to be stretohed so as toenlarge the-aperture sufiicie'ntlyrto permit withdrawal jofthe mandrel from thetube without ruptur- .7

ing the tube.

,-A modification of thejpresent'i-nvention shown in Figs. 2-andr3consists of a;ma ndrel of the serum extraction type suchas disclosed in Fig.1. The-sections 5and[6;of the man- 1 drel shown in Fig. l are provid With interfitting tongues'23, 24, 25 and :26 formed in the material of thesections. Thetongues interfit to form male-and female joints be;

tween" the ends: of the two sections thereby aligning thesectionsand-maintaining thesections inmandrelf form when juxtaposed. v In order ;to secure the sections 5 and 6 together extensions 27 and-28 are provided ontheadjacen-t ends of the sections=5 and 6 -respfectivei ly. The extensions 27and 28 may beine tegral with the sections 5 and 6 ;orsecured thereto by Welding,"braz1ng, riveting or any other suitable manner. When the sections 5 or 6 are juxtaposed in mandrel form the ex tensions stand. 28 fit together alon'g the-interface-29to forma t apered-pin30 ove'rfwhich the collar ;31 may be fitted to secure the-extensions QT-and v28, andytherefore the sections "5 and -6,tog,ether.' Con'duits32 and '33 F are provided for' extracting theffluids from the interio'r:ofthe mandrel-Which 'condui'tsiextend through the extensions 2 7 and 28 Which maybe connected With-any suitable conduit.

A nodifiedforin of jointisshown in -Figs.

4 and 5- in which case --the interfitting members 34 and 35 are secured inthesections-5 and -64in any suitablenianner. The -m"e'inbe'rs s4 and 35 are provided With'ringsh'a'ped lugs whichprovide faces '36 extending flush With the exterior surface of'the sections 5 and 6. "The interfittin'g members 34; and 35a provided With extensionsfi? and '88"respectively which fittog'ether along the :inter'fitting face 39 henjuxtaposed to form a t'aof mandrel construction as shown in Figs.

25 are the same as that outlined in connection with the mandrel construction shown in Fi .1.

is hereinabove pointed out the characteristics of the mandrel which effect the deposition of the solid constituents of a rubber dispersion on the exterior surface thereof are not essential to this invention. The essential features ofthis invention consist of providing an endless mandrel upon which an endless rubber, tube may be formed by deposition from the dispersion which mandrel is in sections and which mandrel may be removed from the interior of the formed tube. Another essential feature of this invention is that the means for securing the sections together be operable, while a rubber tube covers the exterior surface of the mandrel. Other essential features of the invention and various modifications which may be made in the details of the invention are included within the scope of the invention as defined by the following claims.

Having thus described my invention, what I claim and desire to protect by Letters Patent is:

1. A circular mandrel on which rubber tubes may be formed by the deposition of the solid constituents of a rubber dispersion over the exterior surface thereof, said mandrel consisting of at least two segmental sections, members carried on each end of each section and constructed to interfit and to maintain juxtaposed sections in properly centered relation, at least one pair of said members each having a complementary extension projecting from the mandrel, which extensions cooperate to form an aperture in the rubber tube as it is built, and means cooperating with said extensions to clamp the sections in mandrel form.

2. A circular mandrel on which rubber tubes may be formed by the deposition of the solid constituents of a rubber dispersion over the exterior surface thereof, said mandrel consisting of at least two segmental sections, members carried on each end of each section and constructed to interfit and to maintain juxtaposed sections in properly centered relation, at least one pair of said members having an extension projecting from the mandrel and comprlslng cooperating extension elements earned by sa1d SQCtIOIlS, and means cooperating with said extension to clamp'the sections in mandrel form, said extension being arranged to form an aperture in the rub! ber tube during its formation through which aperture the mandrel may be withdrawn fromthetube. J

y 3. A circular hollow mandrel on which rubber tubes may be formed by the deposition ofthe solid constituents of arubber dispersionover the exterior surface'thereof, said mandrel consisting of at least two segmental sections, each end of each section having members constructed to interfit and to maintain uxtaposedsections in properly centered relation, at least one interfitting pair of members having cooperating extension ele. mentsfor securing said sect-ions together in ,mandrel form, and means forconducting fluids from the interior of the mandrel through said extension elements: a

4. 1 Acircular hollow mandrel on which rub ber tubesmay be formed. by the deposition of the solid constituents of a rubber dispersion over the exterior surface thereof, said mandrel consisting of-at least two segmental sections, each end of each secti on'havingmembers constructed to interfit and to maintain juxtaposed sections in properly centered relation,

at least one interfitting pair of members having cooperating extension elements for securing said sections together in mandrel form, and means for conducting fluids from the interior of the mandrel through said extension elements, the extension formed by said elements being arranged to form an aperture in the rubber tube during the formation thereof through which aperture the mandrel may be withdrawn.

5. A circular hollow mandrel on which ruber tubes may be formed by the deposition of the solid constituents of a rubber dispersion over the exterior surface thereof, said mandrel consisting of at least two segmental sections, each end of each section having members constructed to interfit and to maintain juxtaposed sections in properly centered relation, at least one interfitting pair of members having a composite extension proj ecting exteriorly of the mandrel and adapted to form an aperture in the rubber tube during formation thereof, said pair of members having means for conducting fluids from the interior of said mandrel, and said pair of members having means for securing the sections together in mandrel form.

6. A circular hollow mandrel on which rubber tubes may be formed by the deposition of the solid constituents of a rubber dispersion over the exterior surface thereof, said mandrel consisting of two substantially semicircular sections, each end of each section having members constructed to interfit and to form a male and female oint, one pair of interfitting members having extensions adapted when together to form a tapered pin pro- 4 taxman img' exterimly of: the nnazudrerl m cnllam 53 m to fit'tlwtapened pim and lock theme:-

tions together in mandrel form, conduits pnssingrthlroughthe extensions to the interior of the mandrel.

7. A circular hollow mandrel on which nnlixher tubesmaybe formed? by the deposition of the solidconstituents of a rubber dispersion overthe exterior surface thereof; said consisting 0% two substantially semiciremkszr sections, each end of each seetimr members constructed to insterfit and to form an maleiami female joint, one pair 01% imam-fittingmemhershavingzextensions.adapted together to form a; tapered pin projetting: exteriorly of the: mandrel, a cotlan adapted: to fit the tapered pin: and; lock the sections together in mandrel form, conduits paseingt through the extension: to the interior of the mandrel, sai clpinr being an-ran ed to form an aperture in the rnbher' tube 'uring fiolrmwti'om of the tube through which aperture the mandrel may be withdrawn.

Signed at Passaic, county of Passaic, State of New Jersey, this 1&4; day of November-,vl929.

HAROLD T. BATTIN. 

